package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.apache.xmlbeans.impl.xb.xsdschema.Public;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {


    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /**
     * 前置通知，在通知中进行公共字段进行赋值
     */
      @Before("autoFillPointCut()")
      public void autoFill(JoinPoint joinPoint){
          log.info("开始进行公共字段自动填充...");

          //获取当前被拦截方法的数据操作类型
         MethodSignature signature =(MethodSignature) joinPoint.getSignature();    //方法签名对象
         AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);  //获取方法上的注解对象
          OperationType operationType = autoFill.value();   //获取数据库操作类型


          //获取到当前被拦截方法的参数--实体对象
          Object[] args = joinPoint.getArgs();
          if(args == null || args.length == 0){
              return;
          }

        Object  entity =   args[0];
          //准备赋值数据
          LocalDateTime now = LocalDateTime.now();
          Long currentId = BaseContext.getCurrentId();


          //根据当前不同的操作类型，为对应的属性通过反射来赋值
         if(operationType == OperationType.INSERT){
             //为4个公共字段赋值


              try {
                  Method setCreateTime =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                  Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER ,Long.class);
                  Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME ,LocalDateTime.class);
                  Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER , Long.class);

                  //通过反射为对象赋值
                  setCreateTime.invoke(entity,now);
                  setCreateUser.invoke(entity,currentId);
                  setUpdateTime.invoke(entity,now);
                  setUpdateUser.invoke(entity,currentId);

              } catch (Exception e) {
                  e.printStackTrace();
              }



         }else if(operationType == OperationType.UPDATE){

             try {

                 Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME ,LocalDateTime.class);
                 Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER , Long.class);


                 //通过反射为对象赋值
                 setUpdateTime.invoke(entity,now);
                 setUpdateUser.invoke(entity,currentId);

             } catch (Exception e) {
                 e.printStackTrace();
             }



         }


     }




}
